High School: Two-time National Christian School Athletic Association (NCSAA) All-American … Two-time NCSAA Large School National Pitcher of the Year … 2024 San Francisco Chronicle All-Metro Team selection … As a junior in 2024, tossed 126 innings with a 0.33 ERA and 249 strikeouts while hitting .306 … As a sophomore, pitched 98.0 innings with a 0.29 ERA and 205 strikeouts while batting .373 … Helped lead The King's Academy, coached by Mark Street, to the 2024 WBAL League Championship and 2025 Division I California Central Coast Section Championship … Plays club softball for Extreme Rios, coached by Marcos Rios, earning a Top-10 finish at PGF Premier Nationals … 2025 Triple Crown International Challenge Champion with Team Japan alongside fellow signee Laine Macosky … Parents are Ellen and Zac Nesper.
 
Drohan on Nesper: "Katia is a smart, calm competitor who has elite-level spin with a high swing and miss rate. Her commitment to learning – on and off the field – makes her a genuine fit for Northwestern. She has a steadiness about her that her teammates love to play behind." 

Nesper on Choosing Northwestern: "I chose Northwestern because I wanted to be surrounded by like-minded players—people who would push and support me on the softball field and shared a value for academics. I also really liked the style of Northwestern softball. There's a lot of grit to it; it's how I strive to play. I couldn't imagine myself not joining such an incredible team and family."